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Loans Receivable (Write-Offs Segmented by Year of Assignment) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Allowance for Loan and Lease Losses, Write-offs | $ 0.0 | $ 0.0 | $ 0.0
Dealer Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Allowance for Loan and Lease Losses, Write-offs | 0.0 | 0.0 | 0.0
Purchased Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Allowance for Loan and Lease Losses, Write-offs | 0.0 | 0.0 | 0.0
Allowance for Credit Losses [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 312.1 | 225.4 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 184.0 | 277.9 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 223.6 | 208.9 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 314.8 | 226.9 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 191.5 | 271.3 |
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 67.0 | 80.0 |
Allowance for Loan and Lease Losses, Write-offs | 1,293.0 | 1,290.4 | 1,333.8
Allowance for Credit Losses [Member] | Dealer Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 177.6 | 120.6 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 110.5 | 101.3 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 131.3 | 107.0 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 175.0 | 107.2 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 47.6 | 113.3 |
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 16.3 | 17.2 |
Allowance for Loan and Lease Losses, Write-offs | 658.3 | 566.6 | 433.4
Allowance for Credit Losses [Member] | Purchased Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff | 134.5 | 104.8 |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff | 73.5 | 176.6 |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff | 92.3 | 101.9 |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff | 139.8 | 119.7 |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff | 143.9 | 158.0 |
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff | 50.7 | 62.8 |
Allowance for Loan and Lease Losses, Write-offs | $ 634.7 | $ 723.8 | $ 900.4

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